Justin Bieber may be mega-famous, but that doesn't give him licence to slide into just anyone's Instagram DMs.

The 23-year-old 'Sorry' singer was rejected in a brutal public Twitter display after he direct messaged a gym's business Instagram account in an attempt to find out more about one of their employees: receptionist and trainer Jessica Gober.

According to Maxim, the hitmaker contacted the gym in the US state of Georgia where 22-year-old Jessica works after he saw a Boomerang clip (see above) of her on their Instagram page. (Because you know, that's normal and all?!).

Speaking to Buzzfeed, Jessica spoke of her surprise upon learning of the message.

"We were like how in the world did he see this random post," she told the publication. "We only had 70 followers and had posted 5 times previous to this."

The baffled receptionist took to Twitter to reveal Justin's brazen DM, which read, "Who is that girl" followed by a heart emoji.

"Did this actually just happen," Jessica tweeted alongside a screenshot of the message. "Lmao Justin Bieber just messaged the gym that I work at and asked who I was hahahaha WTF."

It didn't end there. People then took aim at Jessica, saying she ruined her chances by tweeting about Justin's message.

But the trainer hit back by posting a photo collage of her looking completely smitten with her boyfriend -- making it clear that she was taken -- and clearly not interested in the Biebs, thank you very much.

"I’ve got everything I need right here," she wrote alongside the pics -- and added a heart emoji.

She later told Buzzfeed, "I didn't post the pictures of my boyfriend and because I thought that Justin Bieber wanted to 'get with me', I posted them in response to everyone commenting that I 'ruined my chances with Justin by tweeting the screenshots'.

"Either way I didn't want a 'chance' because I am perfectly happy with my boyfriend."

It's not the first time Justin's used his star power to pursue a woman. In 2015, he posted a pic of an unknown beauty and wrote alongside it, "Omg who is this!!".

She was later identified as Dutch-born Cindy Kimberly, 17, and she signed with a modeling agency a couple of months later.